Mine override trip prevention method

Abstract

A mine override trip prevention method is characterized in that explosion-proof tanks in layered distribution are adopted, power distribution switches arranged in the same-level explosion-proof tanks are connected onto the same bus, and intelligent protection modules arranged in the same-level explosion-proof tanks are sequentially connected in series through a communication line. The mine override trip prevention method includes steps that: (1) the intelligent protection modules monitor short circuit information of outlet wires of the explosion-proof tanks; (2) all the intelligent protection modules which monitor short circuit or electricity leakage information send trip instructions and simultaneously send locking information to the upper-level intelligent protection module; and (3) trip removal is performed. By adopting the mine override trip prevention method, the intelligent protection modules which already monitor faults can be effectively prevented from tripping simultaneously when load is shorted out and more than two levels of intelligent protection modules monitor fault information, accident happening point seeking is facilitated, underground fan switching power delivery time cannot be affected, gas discharge is ensured to be normal, the phenomenon that underground worker life safety is threatened by gas gathering is avoided, and serious impact on mine safety production caused by production system breakdown is avoided.

Description

technical field [0001] The invention relates to a mine multi-level power supply protection method, in particular to a method for preventing over-level tripping. Background technique [0002] The coal system generally needs to install 3 to 4 levels of protection from the ground substation to the final load. Due to the short circuit and many stages in the mine, in the case of a short circuit or leakage of a load outlet, most of the protection devices that the short circuit current flows through can be protected. A significant change in the current is detected, and the protection device that detects that the current change exceeds the preset value will send a trip signal to remove the short-circuit fault source. If the lowest level of load fails, it may cause the protection device of the upper level or even the ground substation to trip, resulting in a leapfrog trip, causing the accident to expand, which is not conducive to the location of the accident, and also affects the pow...

AI Technical Summary

Problems solved by technology

If the lowest level of load fails, it may cause the protection device of the upper level or even the ground substation to trip, resulting in a leapfrog trip, causing the accident to expand, which is not conducive to the location of the accident, and also affects the power transmission time of the downhole fan switch. It will even affect gas discharge, causing gas accumulation to threaten the life safety of underground workers, and it will also cause the production system to be paralyzed, seriously affecting the safe production of mines

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